CAUTION: Do not attempt to service the system except as explained in the documentation. Only trained service technicians should remove the system cover to access any of the internal components. Refer to the documentation for your server for complete safety information before attempting to service your system.
Following are some possible power problems:

The System Status screen includes
an image of the power supply with a status indicator. You can display
all sensors to view various voltage, fan, etc. sensors associated with the
power supply and their status. Problems with these sensors will generate
an event associated with the power supply.
Refer to the documentation for your server for instructions on installing or replacing a power supply.
After installing a new power supply, allow several seconds for the system to recognize the power supply and determine whether it is working properly. The power indicator lights up green to signify that the power supply is functioning properly.
Also check your power supply component and platform power.
Troubleshooting the Service Processor